Comparison of mechanical and geometrical properties of octet lattice structures using the electron beam melting

Abstract

Additive manufacturing methods allow to produce complex geometries such as lattice structures. Aim of this study is to identify octet truss lattice structure’s mechanical capabilities. Firstly, octet truss structure designed and used to fill specimens. Specimens 1, 2 and 4 with wall and lattice structure, specimen 3 only with lattice structure and also a filled specimen are modelled. Modelled tensile specimens are additively manufactured from Ti-6Al-4V with Electron Beam Melting method. A comparison between specimens having same structural design (1, 2 and 4) has been made to gain insight about consistency of EBM method. Tensile experiments have been made with all of the specimens and tensile strength difference that can be considered significant determined among specimen 1, 2&4. Specimen 3 resulted not to be a practical approach as it showed poor tensile strength values. Lastly, tensile stress results of filled specimen are shared and compared with the other types of specimens. These results are providing a good sight for assessment of both octet truss structure and EBM manufacturing technology.